<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-alert title="添加商品信息" :closable="false" type="warning" center show-icon></el-alert>
      <el-steps :space="200" :active="active-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <el-form :model="addForm" :rules="rules" label-position="top" label-width="100px" ref="addGoods">
        <el-tabs :tab-position="'left'" v-model="active" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input type="number" v-model="addForm.goods_price"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="caderProps"
                @change="handlerChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!--会自动绑定到数组上，每次修改会自动更新绑定的数组-->
              <el-checkbox-group v-model="item.attr_vals" >
                <el-checkbox :label="cd" v-for="(cd ,i) in item.attr_vals" border :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
              <el-upload
                :headers="uploadHeaders"
                :action="uploadUrl"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                type="file"
                list-type="picture"
                :on-success="uploadSuccess"
              >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="4">
            <quill-editor ref="myQuillEditor" v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary" style="margin-top: 20px" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <el-dialog title="图片预览" :visible.sync="PreviewDialog" width="50%">
      <img :src="previewPath" class="imagePreview"/>
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data () {
    return {
      active: '0',
      addForm: {
        goods_cat: [],
        pics: [],
        attrs: []
      },
      rules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      cateList: [],
      caderProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      manyTableData: [],
      onlyTableData: [],
      uploadUrl: 'http://127.0.0.1:8888/api/private/v1/upload',
      uploadHeaders: { authorization: sessionStorage.getItem('token') },
      PreviewDialog: false,
      previewPath: ''
    }
  },
  methods: {
    async getCateList () {
      const { data } = await this.$http.get('categories')
      if (data.meta.status !== 200) return this.$message.error('获取商品信息失败')
      this.cateList = data.data
    },
    async tabClicked () {
      if (this.active === '1') {
        const { data } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (data.meta.status !== 200) return this.$message.error(data.meta.msg)
        data.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = data.data
      } else if (this.active === '2') {
        const { data } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (data.meta.status !== 200) return this.$message.error(data.meta.msg)
        this.onlyTableData = data.data
        // console.log(this.onlyTableData)
      }
    },

    add () {
      this.$refs.addGoods.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        this.handleAttrs()
        form.attrs = this.addForm.attrs
        const { data } = await this.$http.post('goods', form)
        if (data.meta.status !== 201) return this.$message.error(data.meta.msg)
        this.$message.success('添加成功')
      })
      this.$router.push('/goods')
    },

    handlerChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请完善商品基本信息')
        return false
      }
    },
    // 处理图片的预览效果
    handlePreview (file) {
      this.PreviewDialog = true
      this.previewPath = file.response.data.url
    },
    handleRemove (file) {
      const index = this.addForm.pics.findIndex(x => x.pic === file.response.data.tmp_path)
      // 从pics数组中获取对应的图片的索引值
      this.addForm.pics.splice(index, 1)
    },
    uploadSuccess (res) {
      const picPath = { pic: res.data.tmp_path }
      this.addForm.pics.push(picPath)
    },

    handleAttrs () {
      this.manyTableData.forEach(item => {
        const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') }
        this.addForm.attrs.push(newInfo)
      })
      this.onlyTableData.forEach(item => {
        const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
        this.addForm.attrs.push(newInfo)
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  },
  created () {
    this.getCateList()
  }
}
</script>

<style lang="scss" scoped>
.el-dialog {
  img {
    width: 100%;
    height: 100%;
  }
}
</style>
